Unless otherwise configured, the client libraries use Application Default Credentials to authenticate with Google Cloud Services. While this works for most applications, in some cases you may need to override this default. You can do so by providing the UnifiedCredentialsOption The following example shows how to explicitly load a service account key file:
[](std::string const& keyfile) {
auto is = std::ifstream(keyfile);
is.exceptions(std::ios::badbit); // Minimal error handling in examples
auto contents = std::string(std::istreambuf_iterator<char>(is.rdbuf()), {});
auto options =
google::cloud::Options{}.set<google::cloud::UnifiedCredentialsOption>(
google::cloud::MakeServiceAccountCredentials(contents));
return google::cloud::support_v2::CaseAttachmentServiceClient(
google::cloud::support_v2::MakeCaseAttachmentServiceConnection(
options));
}
Follow these links to find examples for other *Client classes:
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-03-21 UTC."],[[["This page documents how to override the default authentication credentials, which typically use Application Default Credentials, for Google Cloud services."],["The `UnifiedCredentialsOption` can be used to override default credentials, such as by explicitly loading a service account key file."],["The example provided demonstrates using `MakeServiceAccountCredentials` to set authentication credentials, and is applicable to `CaseAttachmentServiceClient`, `CaseServiceClient`, and `CommentServiceClient`."],["The documentation also contains links for other client classes, and provides a link to best practices for managing service account keys."],["The page provides a list of documentation for older versions, going from version `2.37.0-rc` down to version `2.11.0`, as well as a dropdown for version `2.14.0`."]]],[]]
